February 2, 201412 yr I am running 5.05. I have the recommended Supermicro MB with about 15 discs. I have been been getting an average of about 11 MB/s transfer speeds which I consider to be much slower than what I have seen other people get on this forum. Given the many disks riding on PCI-E cards I figured I'd add a cache disk, and so, I grabbed a 4TB WD Black that could also act as a spare when the need arises. Both this drive and the parity are plugged into the motherboard sata sockets which are themselves set to sata enhanced in the BIOS. I've enabled the cache in the share and subsequently rebooted. I can see that the cache is being written to, but I am still getting the same 11MB/s as before. All switches and computers LAN ports are gigabit, and the orange lights confirm this. What else should I look for? Thanks for any advice you might have.
February 2, 201412 yr Just a thought: Do you have an ethernet switch that doesn't 'auto negotiate' speeds? A GigE ethernet switch that doesn't will limit the speed of ALL connections to the speed of the slowest device. An older printer, perhaps, that only goes 10Meg?
February 2, 201412 yr I suppose make sure it's your disk first. Test your speed with a very basic set of lines or script like this. dd if=/dev/zero of=/mnt/disk1/test.dd count=1024000 bs=1024 sync echo 3 > /proc/sys/vm/drop_caches dd if=/mnt/disk1/test.dd of=/dev/null rm /mnt/disk1/test.dd Choose each destination you want to test with the of= parameter. You should get from 20-40 perhaps up to 65MB/s for writes depending on how full the drive is and the speed of the drive to begin with. Your read speed should be maximum for the drive. This will help isolate if it's the network or disk subsystem. There have been reports in the past that too much memory can slow down writes. There are parameters that can be used to limit ram to 4GB or less (scan the forum for mem=).
February 3, 201412 yr Author Just a thought: Do you have an ethernet switch that doesn't 'auto negotiate' speeds? A GigE ethernet switch that doesn't will limit the speed of ALL connections to the speed of the slowest device. An older printer, perhaps, that only goes 10Meg? That was it. I'm now getting reads in the 70s and writes in the 40s. Thanks.
February 3, 201412 yr Author SATA enhanced is not correct. They should be set for AHCI. I'll drag my keyboard and monitor over the next time I shut down the UnRaid box and check that out but, from memory, I'm almost sure that I do have AHCI selected. In the IDE configuration submenu wherein I get to configure SATA#1/SATA#2 settings the options are Disabled, Compatible and Enhanced. As I have no IDE drives, I figured enhanced was the way to go.
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